format long e
x1=[0 5 10 15 20 25];
y1=[7.054845205980959e-01 3.989971000875949e-01 2.240213375513342e-01 1.257797580440632e-01 7.077839164546965e-02 3.958134703563037e-02];
y2=[7.572408596545138e-01 4.287435648497445e-01 2.441055641762963e-01 1.384913812835700e-01 7.969837149742017e-02 4.452646826334462e-02];
y3=[8.331501674843440e-01 4.683532828808038e-01 2.644949458512731e-01 1.477820308616229e-01 8.416488038213442e-02 4.645779792314460e-02];
y4=[5.002223721979366e-01 1.581842032718106e-01 5.002223721979702e-02 1.581842032718028e-02 5.002223721980014e-03 1.581842032717958e-03];
c1=semilogy(x1,y1,'-d');
hold on
c2=semilogy(x1,y2,'-p');
hold on
c3=semilogy(x1,y3,'-s');
hold on
c4=semilogy(x1,y4,'-v');
ylabel('RMSE(m)');
xlabel('1/\sigma^{2}(dB)');
grid on;